Regarding your r-code....whenever you switch platforms you must recompile. Hopefully you have access to the source code. If not, then I'm guessing you have purchased your software package and if that's the case, then you should contact your application vendor for assistance there.

Just out of curiosity, what are your plans to migrate the database from 10.20 to 11? Have you given any thoughts of upgrading to a more recent Progress version? Of course, if 11.i is your desire then you must upgrade your Progress.